Renormalized Schwinger-Dyson functional

TL;DR

This paper develops a renormalization procedure for the Schwinger-Dyson functional, crucial for understanding expectation values in topological quantum field theories like Chern-Simons and BF theories.

Contribution

It introduces a canonical renormalization method for the Schwinger-Dyson functional and explores its structure in scalar and gauge field theories.

Findings

Renormalized Schwinger-Dyson functional is obtained for scalar models.

The relationship between the functional and gauge field correlations is established for Chern-Simons and BF theories.

A combinatorial analysis of Feynman diagrams supports the renormalization approach.

Abstract

We consider the perturbative renormalization of the Schwinger-Dyson functional, which is the generating functional of the expectation values of the products of the composite operator given by the field derivative of the action. It is argued that this functional plays an important role in the topological Chern-Simons and BF quantum field theories. It is shown that, by means of the renormalized perturbation theory, a canonical renormalization procedure for the Schwinger-Dyson functional is obtained. The combinatoric structure of the Feynman diagrams is illustrated in the case of scalar models. For the Chern-Simons and the BF gauge theories, the relationship between the renormalized Schwinger-Dyson functional and the generating functional of the correlation functions of the gauge fields is produced.